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Goodwill and Intangible Assets (Schedule of Amortization Expense for Finite-Lived Intangible Assets) (Detail) (USD $)
In Millions, unless otherwise specified
Oct. 31, 2014
Jan. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 (remainder of the fiscal year) $ 2  
2016 8  
2017 7  
2018 5  
2019 3  
2020 and thereafter 1  
Net carrying value $ 26 $ 79